Remove dependency on @react-native-async-storage/async-storage (#7570)

Author: hsubox76

.changeset/eleven-lamps-give.md

@@ -0,0 +1,6 @@
+---
+'@firebase/auth': minor
+'firebase': minor
+---
+
+Remove dependency on @react-native-async-storage/async-storage and add warnings to remind React Native users to manually import it.

packages/auth/index.rn.ts

@@ -23,13 +23,12 @@
  */
 
 import { FirebaseApp, getApp, _getProvider } from '@firebase/app';
-import { Auth } from './src/model/public_types';
+import { Auth, Dependencies } from './src/model/public_types';
 
-import { initializeAuth } from './src';
+import { initializeAuth as initializeAuthOriginal } from './src';
 import { registerAuth } from './src/core/auth/register';
 import { ClientPlatform } from './src/core/util/version';
-import { getReactNativePersistence } from './src/platform_react_native/persistence/react_native';
-import ReactNativeAsyncStorage from '@react-native-async-storage/async-storage';
+import { _logWarn } from './src/core/util/log';
 
 // Core functionality shared by all clients
 export * from './index.shared';
@@ -49,7 +48,21 @@ export {
 // MFA
 export { PhoneMultiFactorGenerator } from './src/platform_browser/mfa/assertions/phone';
 
-export { getReactNativePersistence };
+export { getReactNativePersistence } from './src/platform_react_native/persistence/react_native';
+
+const NO_PERSISTENCE_WARNING = `
+You are initializing Firebase Auth for React Native without providing
+AsyncStorage. Auth state will default to memory persistence and will not
+persist between sessions. In order to persist auth state, install the package
+"@react-native-async-storage/async-storage" and provide it to
+initializeAuth:
+
+import { initializeAuth, getReactNativePersistence } from 'firebase/auth';
+import ReactNativeAsyncStorage from '@react-native-async-storage/async-storage';
+const auth = initializeAuth(app, {
+  persistence: getReactNativePersistence(ReactNativeAsyncStorage)
+});
+`;
 
 export function getAuth(app: FirebaseApp = getApp()): Auth {
   const provider = _getProvider(app, 'auth');
@@ -58,9 +71,25 @@ export function getAuth(app: FirebaseApp = getApp()): Auth {
     return provider.getImmediate();
   }
 
-  return initializeAuth(app, {
-    persistence: getReactNativePersistence(ReactNativeAsyncStorage)
-  });
+  // Only warn if getAuth() is called before initializeAuth()
+  _logWarn(NO_PERSISTENCE_WARNING);
+
+  return initializeAuthOriginal(app);
+}
+
+/**
+ * Wrapper around base `initializeAuth()` for RN users only, which
+ * shows the warning message if no persistence is provided.
+ * Double-checked potential collision with `export * from './index.shared'`
+ * as `./index.shared` also exports `initializeAuth()`, and the final
+ * bundle does correctly export only this `initializeAuth()` function
+ * and not the one from index.shared.
+ */
+export function initializeAuth(app: FirebaseApp, deps?: Dependencies): Auth {
+  if (!deps?.persistence) {
+    _logWarn(NO_PERSISTENCE_WARNING);
+  }
+  return initializeAuthOriginal(app, deps);
 }
 
 registerAuth(ClientPlatform.REACT_NATIVE);

packages/auth/package.json

@@ -103,13 +103,18 @@
     "typings:public": "node ../../scripts/build/use_typings.js ./dist/auth-public.d.ts"
   },
   "peerDependencies": {
-    "@firebase/app": "0.x"
+    "@firebase/app": "0.x",
+    "@react-native-async-storage/async-storage": "^1.18.1"
+  },
+  "peerDependenciesMeta": {
+    "@react-native-async-storage/async-storage": {
+      "optional": true
+    }
   },
   "dependencies": {
     "@firebase/component": "0.6.4",
     "@firebase/logger": "0.4.0",
     "@firebase/util": "1.9.3",
-    "@react-native-async-storage/async-storage": "^1.18.1",
     "node-fetch": "2.6.7",
     "tslib": "^2.1.0"
   },

yarn.lock

@@ -3263,13 +3263,6 @@
   resolved "https://registry.npmjs.org/@protobufjs/utf8/-/utf8-1.1.0.tgz#a777360b5b39a1a2e5106f8e858f2fd2d060c570"
   integrity sha1-p3c2C1s5oaLlEG+OhY8v0tBgxXA=
 
-"@react-native-async-storage/async-storage@^1.18.1":
-  version "1.19.0"
-  resolved "https://registry.npmjs.org/@react-native-async-storage/async-storage/-/async-storage-1.19.0.tgz#594aca9c20924b7955d62cf43797b4187e1e6cf8"
-  integrity sha512-xOFkz/FaQctD6yNJDur+WnHdSTigOs3pTz6HmfC8X8PYwcnnN3R9UxuWiwsfK8vvT2WioAxUkQt3lB7GySNA2w==
-  dependencies:
-    merge-options "^3.0.4"
-
 "@rollup/[email protected]":
   version "3.1.9"
   resolved "https://registry.npmjs.org/@rollup/plugin-alias/-/plugin-alias-3.1.9.tgz#a5d267548fe48441f34be8323fb64d1d4a1b3fdf"
@@ -12290,13 +12283,6 @@ [email protected]:
   resolved "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz#b00aaa556dd8b44568150ec9d1b953f3f90cbb61"
   integrity sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E=
 
-merge-options@^3.0.4:
-  version "3.0.4"
-  resolved "https://registry.npmjs.org/merge-options/-/merge-options-3.0.4.tgz#84709c2aa2a4b24c1981f66c179fe5565cc6dbb7"
-  integrity sha512-2Sug1+knBjkaMsMgf1ctR1Ujx+Ayku4EdJN4Z+C2+JzoeF7A3OZ9KM2GY0CpQS51NR61LTurMJrRKPhSs3ZRTQ==
-  dependencies:
-    is-plain-obj "^2.1.0"
-
 merge-stream@^2.0.0:
   version "2.0.0"
   resolved "https://registry.npmjs.org/merge-stream/-/merge-stream-2.0.0.tgz#52823629a14dd00c9770fb6ad47dc6310f2c1f60"